According to TMZ, Rob spent a TON of money on Blac Chyna's 7 carat, round brilliant cut diamond engagement ring. Not to mention the rock is of VS1 clarity which means it's the best cut of diamond available on the market.

DAYUM. Tygais probably stressing over how he'll top this one when it comes time to propose toKylie Jenner!

So, how much did R.K. put down for the bling?

Apparently, Kardashian spent a whopping $325,000 dollars on his fiancée!

WOAH.

To make matters even better (Twitter trolls, you'll love this one), the reality star paid a visit toKanye West's favorite jeweler Ben Baller for the design. We can only wonder what Kanye thinks about this coincidence…